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05-26-2017, 10:53 AM
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#1
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Senior Member
Join Date: Jul 2016
Posts: 202
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Mysterious blue lines with no shutoff
Cardinal 2o17 3456rl. Noticed water coming from this line while flushing black tank. Anyone know what they are 
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If not camping, I am Sailing
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05-26-2017, 11:29 AM
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#2
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Senior Member
Join Date: Dec 2012
Posts: 7,652
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If that water is coming from your black tank cleanout plumbing you have a serious plumbing issue. The factory installed cleanout is a closed self contained system.
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05-26-2017, 11:32 AM
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#3
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Senior Member
Join Date: Jul 2016
Posts: 202
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Flush works fine. I do have very high pressure though on my supply line to the flush connection.
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If not camping, I am Sailing
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05-26-2017, 11:36 AM
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#4
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Regardless of the pressure, the black tank flush is more or less a closed circuit with the only outlet being the roof vent, inlet, toilet and the sewer hose connection.
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05-26-2017, 12:15 PM
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#5
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Senior Member
Join Date: Jul 2016
Posts: 202
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Getting back-to the original question does anyone know what those 2 blue lines are
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If not camping, I am Sailing
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05-26-2017, 12:19 PM
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#6
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by JohnVtx
Getting back-to the original question does anyone know what those 2 blue lines are
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That's what we're trying to address, by telling you it should not be connected in any way to your black tank flush. It will be up to you to trace the lines and may require you to look inside the belly covering.
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05-26-2017, 12:24 PM
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#7
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Senior Member
Join Date: Jul 2016
Posts: 202
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Well we determine that 3 of us don't know what they're for
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If not camping, I am Sailing
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05-26-2017, 12:29 PM
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#8
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by JohnVtx
Well we determine that 3 of us don't know what they're for
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And only one has seen them up close and personal. 
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05-26-2017, 12:37 PM
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#9
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Out of Order
Join Date: Jan 2016
Location: Concord, CA
Posts: 89
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On my trailer, the blue lines are the low point drain for the fresh water tank. The only difference being mine has an on/off spigot attached to the end and yours simply shows an open tube. The color of the line would indicate a fresh water drain.
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Todt and Connie and Hank the Doodle
2016 Wildcat Maxx 24RG
2016 Ford F250 6.7L Diesel
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05-26-2017, 12:39 PM
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#10
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Member
Join Date: Aug 2011
Posts: 73
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That would be my first guess too. They have to be fresh water tank oveflow/vent lines.
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2015 Ford F350 CC SB 4x4
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05-26-2017, 12:40 PM
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#11
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by todtc318
On my trailer, the blue lines are the low point drain for the fresh water tank. The only difference being mine has an on/off spigot attached to the end and yours simply shows an open tube. The color of the line would indicate a fresh water drain.
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Agree, but if the system is completely dry and you hook up the black tank flush you should NOT get water out of either low point drains even with the caps off or valves open.
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05-26-2017, 12:48 PM
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#12
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Senior Member
Join Date: Sep 2015
Posts: 3,464
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The valve could be located up higher.
I see one line with a valve further back.
That would most likely be the fresh drain.
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2017 Dynamax Isata 4
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05-26-2017, 12:48 PM
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#13
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Senior Member
Join Date: Jul 2016
Posts: 202
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I have a blue line with the valve on it about a foot to the left of it which is my freshwater tank
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If not camping, I am Sailing
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05-26-2017, 12:57 PM
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#14
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Senior Member
Join Date: Jul 2007
Location: Jefferson County, MO
Posts: 5,453
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I am wondering if your black tank flush and fresh water fill are either mislabeled or plumbed incorrectly. As others have stated, when using the black tank flush no water should be coming out of the plumbing other than the sewer.
It sure looks to me like it’s the fresh water tank overflow line.
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Bob and Joyce
2013 CC Silverback 29RL
2010 Ford F250 XL Crew Cab 6.4 liter diesel
ATU Local 788
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05-26-2017, 01:17 PM
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#15
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Senior Member
Join Date: Jan 2012
Location: Venice, Florida
Posts: 141
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could be the fresh water fill and the black water flush lines are reversed or miss labeled.
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 Dick & Betty
2016 Chevy Silverado 1500 crew cab
2017 Grey Wolf 23mk
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05-26-2017, 01:20 PM
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#16
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Senior Member
Join Date: Feb 2017
Location: SW Ohio
Posts: 1,694
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did the water start and stop with the black tank flushing? Or did you just happen to notice it while you were flushing?
what is above those lines in the trailer?
EDIT:
is this a brand new trailer with clean tanks? If so remove the sewer cap and open the black tank dump valve and try flushing. if nothing comes out try the other hose fitting.
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05-26-2017, 01:31 PM
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#17
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Scoundrel
Join Date: Feb 2017
Location: Montrose, Colorado
Posts: 2,810
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Others here might disagree with me, but I would consider dropping half a teaspoon of mild dish soap in the black tank and run the flush cycle. If soap bubbles come out of those blue lines you definitely have some issues to resolve.
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05-26-2017, 02:15 PM
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#18
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Senior Member
Join Date: Jul 2016
Posts: 202
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Lines are not reversed. Black tank valve open water starts and stops when I turn incoming hose on and off. Fresh water tank was only 1/3 full when I was flushing, so probably not that overflow. I have flushed 3 times before.
I will have to remove bottom to see what is above.
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If not camping, I am Sailing
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05-26-2017, 04:58 PM
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#19
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Senior Member
Join Date: Jul 2016
Posts: 202
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I have the Nautilus P1 water management sytem. It only drips out that pipe when I am flushing black tank and all the controls are set to Dry Camping
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If not camping, I am Sailing
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05-27-2017, 10:16 AM
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#20
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Senior Member
Join Date: Jun 2015
Location: Payson, AZ
Posts: 3,874
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just guessing. it looks like the trailer is leaning to one side (one set of wheels on asphalt, the other on grass). if fresh water tank was full it could be the lean is causing water to exist the overflow. could the other one be a drain from the refrigerator? there no way I can conceive of a drain like that to be associated with either the black or gray tanks. send that picture to the cardinal support person at forest river and ask them.
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2015 dodge ram 3500 dually
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